2-21总结

今天练习了csdn里的一个书籍添加代码，大部分是复制粘贴的，仅仅自己看了代码 改掉了一点东西。比之前看的美观点了。

 

//IntelliJ IDEA
//JavaWebProject1
//Book


package com.lyb.bean;

public class Book {
    private int id;     //编号
    private String name;    //图书名称
    private double price;   //价格
    private int bookCount;  //数量
    private String author;  //作者

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public int getBookCount() {
        return bookCount;
    }

    public void setBookCount(int bookCount) {
        this.bookCount = bookCount;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }
}
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="java.sql.Connection" %>
<%@ page import="java.sql.DriverManager" %>
<%@ page import="java.sql.SQLException" %>
<%@ page import="java.sql.PreparedStatement" %>
<html>
<head>
    <title>添加结果</title>
    <style type="text/css">
        body{
            background: #d7c7e9;
            align-content: center;
            text-align: center;
        }
    </style>
</head>
<body>
<%request.setCharacterEncoding("UTF-8");%>
<jsp:useBean id="book" class="com.lyb.bean.Book"></jsp:useBean>
<jsp:setProperty name="book" property="*"/>
<%
    Connection conn =null;
    try{
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
            out.print("驱动器加载失败");
        }
        String url = "jdbc:mysql://localhost:3306/demo";
        String username = "root";
        String password = "135790";
        try{
            conn = DriverManager.getConnection(url,username,password);
        }catch (SQLException e){
            out.println(e.getMessage());
            out.println("数据库连接失败");
        }
        if(conn != null){
            String sql = "insert into tb_books(name,price,bookCount,author)values(?,?,?,?)";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1,book.getName());
            ps.setDouble(2,book.getPrice());
            ps.setInt(3,book.getBookCount());
            ps.setString(4,book.getAuthor());
            int row = ps.executeUpdate();
            if(row>0){
                out.println("成功添加了" + row + "条数据！");
            }
        }
    }catch (Exception e){
        e.printStackTrace();
        out.print("图书信息添加失败！");
    }
%>
<br>
<a href="book.jsp">返回</a>
</body>
</html>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>图书信息登记</title>
    <style type="text/css">
        body{
            background: #d7c7e9;
            align-items: center;
            text-align: center;
        }
    </style>
    <script type="text/javascript">
        function check(form){
            with(form){
                if(name.value === ""){
                    alert("图书名称不能为空");
                    return false;
                }
                if(price.value === ""){
                    alert("价格不能为空");
                    return false;
                }
                if(bookCount.value === ""){
                    alert("图书数量不能为空");
                    return false;
                }
                if(author.value === ""){
                    alert("作者不能为空");
                    return false;
                }
                return true;
            }
        }
    </script>
</head>
<body>
<form action="AddBook.jsp" method="post" onsubmit="return check(this);">
    <table align="center" width="450">
        <tr>
            <td align="center" colspan="2">
                <h2>添加图书信息</h2>
                <hr>
            </td>
        </tr>
        <tr>
            <td align="right">图书名称：</td>
            <td>
                <label>
                    <input type="text" name="name"/>
                </label>
            </td>
        </tr>
        <tr>
            <td align="right">价格：</td>
            <td>
                <label>
                    <input type="text" name="price"/>
                </label>
            </td>
        </tr>
        <tr>
            <td align="right">数量：</td>
            <td>
                <label>
                    <input type="text" name="bookCount"/>
                </label>
            </td>
        </tr>
        <tr>
            <td align="right">作者：</td>
            <td>
                <label>
                    <input type="text" name="author"/>
                </label>
            </td>
        </tr>
        <tr>
            <td align="center" colspan="2">
                <input type="submit" value="提交">
            </td>
        </tr>
    </table>
</form>
</body>
</html>

运行结果的截图

 

posted @ 2023-02-21 21:07  晚风依旧啊  阅读(23)  评论(0)    收藏  举报